Very nice job, but your floats are too close together. Your airplane will blow over in the slightest crosswind.

A couple of years ago I wrote a product review on the Slow Stick for Model Aviation. Part of that review concerned installing floats on it. Here is that part of the text.

Floats

GWS makes a nice, lightweight set of floats that are just the right size for the Slow Stick. So of course I had to try it on the water!

The floats come as a kit that requires the assembler to trim and glue the vacuum formed plastic bottoms to the molded foam tops. A hardwood backbone and wire struts are included along with all of the necessary hardware. Water rudders are not included, and under the calm conditions the Slow Stick needs, they are not needed.

Gluing the top and bottom of the floats together can be a challenge, but I found that using tape to hold the sides of the plastic parts up against the foam while the glue set (epoxy or aliphatic) worked well enough .

The wire struts and spreader bars that come with the kit are not suitable for the Slow Stick, so I bent new longer ones using the same size wires. I mounted the floats 12 3/4” apart and 6 1/2” below the fuselage stick, which makes the outward angle of the struts very close to the ideal 45 degrees. The step is about 1” behind the airplanes CG and the fuselage stick is about 2 degrees positive to the top of the floats. I bent the top of my new struts to match the shape of the Slow Stick’s main landing gear struts and I made a plywood sandwich to clamp them to the fuselage stick. At first the these struts seemed awfully flexible, but they worked very well on the water.

The Slow Stick is basically a water proof airplane. Give the ESC and all of the electrical connectors a bath in CorrosionX or similar waterproofer and you don’t have to worry about dunking it. Fresh water will not hurt the battery, motor, servos or receiver. I have flipped the Stick several times, retrieved it, blown the water off and taken off again.

Flying on floats

Flying the Slow Stick on floats is even more fun, if that is possible. It “levitates” off the water. The pendulum effect of the floats and the slightly higher wing loading seems to calm the airplane down a bit and gives it a bit more wind tolerance.

The only caution is not to try and run too long on the water. The GWS floats will tend to dart off to one side or the other if you try to hold the airplane on the water after flying speed is reached. Just let it take itself off. And don’t try to taxi crosswind, but that’s good advice for any float plane.

“Slow, smooth, relaxing and fun”. I am going to take the Slow Stick to every float fly I attend. Nothing is better for the late evenings after a busy, exciting and noisy day of flying the bigger stuff.

Float spread

The width between the floats is the important part. (And the position of the step in relation to the CG, but you seem to have that about right.) If you spread the standard landing gear wide enough, you will not have enough height to keep the prop out of the water. (There should be at least an inch between the bottom of the prop and the top of the floats.)

You may be able to do it by making longer spreaders and then figuring out a way to attach them to the bottom of the standard landing gear, but that might start to get heavy and weak.

The best way is to make two new landing gear. You can buy the wire at any hobby shop and bend it with a pair of plyers.

You might even want to go a little wider than that, especially for a 3-channel model since you can't counter a crosswind with ailerons. I've flown models with floats spaced at almost 1/3 span and they had great handling on the water.

I was about to offer the same advice. The Flying Boat conversion for the SlowStick is probably the best way to get started on the water... very stable and plenty of flotation, and it would be easy to add a water rudder if you wanted. I made mine a little differently, but you get the idea.

Some beautiful birds on these pages!!!
A couple of years back i stuck a set of Reach fiberglass floats on a little foamie WaCo YMF, the thing flys very nicely from either water or grass, it has proven to be a nice relaxing little combo.

Hey Trumps, I remember that Waco... I believe it's the same 39"ws foamie sold from Hobby Lobby but here in the USA ours is yellow. Inspired by your plane, I have been considering putting floats on the larger 50"ws Dynam Waco from Nitroplanes... I just need to find appropriately sized floats for it.

Yup, same same as the hobby lobby one, pretty sure these things are near on the uncrashable plane, doubles as a good drift car on wet grass, sometimes i do complete circuits sideways on our oval without taking off, much fun Perth is a windy little city unfortunately, we just have to deal with it or else we would never get to fly.
If you ever see a set of these Reach floats they are well worth a look, beautiful quality, and light weight!